More than a dozen years after The Velvet Underground called it quits, the band was contacted by Verve, the record label that had released the legendary avant-garde rock act’s debut LP as well as its chaotic follow-up, White Light/White Heat. A 1980s-era CD reissuing effort of VU’s albums at the label turned up a bunch of unreleased and “mostly unmixed” recordings that were deep in its parent company’s vaults.